Retractor with a clamp mechanism

Abstract

In a retractor with a clamp mechanism for holding a webbing directly in a vehicle emergency, the retractor provides a movable clamp member for holding the webbing between the lower plate and the clamp member, and a guide member for guiding the clamp member to a webbing holding position, in which the clamp member includes a clamp teeth portion for clamping and engaging the webbing with a webbing opposing surface of the clamp member, a plane portion located on an opposite side to the webbing opposing surface, and a rear end side edge provided on a rear end side of the plane portion, and in which the guide member includes a sliding contact surface for sliding contact with the plane portion of the clamp member and a deforming portion deformable substantially in parallel to the webbing opposing surface of the clamp member. A movable wedge-shaped clamp member may be provided with a hold portion including a clamp teeth portion formed in a shape capable of biting into a surface of the webbing and shearable and deformable by a tensile force of a predetermined value or greater, and including a pressure teeth portion capable of applying resistance to the webbing moved in the webbing draw-out direction by a tensile force of a predetermined value or greater.

What is claimed is: 
     
       1. A retractor including a clamp mechanism for holding a webbing directly in a vehicle emergency, comprising: a retractor base;   a lower plate fixed to said retractor base;   a movable clamp member for holding a webbing between said lower plate and said clamp member.; and   a guide member for guiding said clamp member to a webbing holding position,   wherein said clamp member includes a clamp teeth portion for clamping and engaging said webbing with a webbing opposing surface of said clamp member, a plane portion located On an opposite side to said webbing opposing surface, and a rear end side edge on a rear end side of said plane portion,   wherein said guide member includes a sliding contact surface for sliding contact with said plane portion of said clamp member and a deforming portion deformable substantially in parallel to said webbing opposing surface of said clamp member,   wherein said deforming portion of said guide member is structured so that said deforming portion is deformed by said rear end side edge of said clamp member, if a tensile force of a predetermined value or greater is applied to said webbing, in accordance with the movement of said clamp member in a webbing draw-out direction.   
     
     
       2. A retractor including a clamp mechanism for holding a webbing directly in a vehicle emergency, comprising: a retractor base;   a lower plate fixed to said retractor base;   a movable clamp member for holding a webbing between said lower plate and said clamp member; and   a guide member for guiding said clamp member to a webbing holding position,   wherein said clamp member includes a clamp teeth portion for clamping and engaging said webbing with a webbing opposing surface of said clamp member, a plane portion located on an opposite side to said webbing opposing surface, and a rear end side edge on a rear end side of said plane portion,   wherein said guide member includes a sliding contact surface for sliding contact with said plane portion of said clamp member and a deforming portion deformable substantially in parallel to said webbing opposing surface of said clamp member, wherein said guide member includes:   a main cantilever piece having a leading end thereof projected as a free end;   an extension tongue portion formed in the leading end of said main cantilever piece;   a sub-cantilever piece opposed to said extension tongue portion;   a first deforming portion located on a base end side of said main cantilever piece; and   a second deforming portion located on a base end side of said sub-cantilever piece;   wherein said guide member is structured so that, if a tensile force of a predetermined value or greater is applied to said webbing, said first deforming portion is deformed by said rear end side edge of said clamp member in accordance with the movement of said clamp member in a webbing draw-out direction, and said second deforming portion is deformed by said main cantilever piece folded by the deformation of said first deforming portion.   
     
     
       3. A retractor including a clamp mechanism for holding a webbing directly in a vehicle emergency, comprising: a retractor base;   a deforming pin inserted through said retractor base;   a lower plate fixed to said retractor base;   a movable clamp member for holding a webbing between said lower plate and said clamp member; and   a guide member for guiding said clamp member to a webbing holding position,   wherein said clamp .member includes a clamp teeth portion for clamping and engaging said webbing with a webbing opposing surface of said clamp member, a plane portion located on an opposite side to said webbing opposing surface, and a rear end side edge on a rear end side of said plane portion,   wherein said guide member includes a sliding contact surface for sliding contact with said plane portion of said clamp member and a deforming portion deformable substantially in parallel to said webbing opposing surface of said clamp member,   wherein said guide member includes a cantilever piece having a leading end thereof projected as a free end and an extension tongue piece formed in the leading end of said cantilever piece, and   wherein said guide member is structured so that, if a tensile force of a predetermined value or greater is applied to said webbing, the deforming portion of said guide member is deformed by said rear end side edge in accordance with the movement of said clamp member in a webbing draw-out direction, and said deforming pin is deformed by said extension tongue piece of said cantilever piece folded by the deformation of said deforming portion.   
     
     
       4. A retractor including a clamp mechanism for holding a webbing directly to prevent the webbing from being drawn out in a vehicle emergency, comprising: a retractor base;   a winding shaft supported rotatably on said retractor base for winding a webbing thereround;   a ratchet plate mounted on said winding shaft;   a pawl member engageable with said ratchet plate for locking the rotation of said winding shaft in a webbing draw-out direction thereof;   a lower plate fixed to said retractor base;   a movable clamp member for holding said webbing between said lower plate and said clamp member;   a guide member for guiding said clamp member to a webbing holding position;   an emergency lock mechanism for locking the rotation of said winding shaft in the webbing draw-out direction; and   a lever member for moving said clamp member in a webbing holding direction coupled to said emergency lock mechanism,   wherein said clamp member includes a clamp teeth portion for clamping and engaging said webbing with a webbing opposing surface of said clamp member, a plane portion located on an opposite side to said webbing opposing surface, and a rear end side edge on a rear end side of said plane portion,   wherein said guide member is formed of a hollow member having a rectangular section, said guide member including a sliding contact surface for sliding contact with said plane portion of said clamp member and a deforming portion deformable substantially in parallel to said webbing opposing surface of said clamp member,   wherein said deforming portion of said guide member is structured so that said deforming portion is deformed by said rear end side edge of said clamp member, if a tensile force of a predetermined value or greater is applied to said webbing, in accordance with the movement of said clamp member in a webbing draw-out direction.   
     
     
       5. The retractor of claim 4, wherein said emergency lock mechanism includes: an inertia member rotatably following said winding shaft;   a ratchet member rotatable together with said winding shaft in the webbing draw-out direction to engage said pawl member with said ratchet plate for locking the rotation of said winding shaft in the webbing draw-out direction; and   lock means for connecting said ratchet member with said winding shaft in accordance with a rotational delay of said inertia member with respect to said winding shaft.   
     
     
       6. A retractor including a clamp mechanism for holding a webbing directly to prevent the webbing from being drawn out in a vehicle emergency, comprising: a retractor base;   a winding shaft supported rotatably on said retractor base for winding a webbing thereround;   a ratchet plate mounted on said winding shaft:   a pawl member engageable with said ratchet plate for locking the rotation of said winding shaft in a webbing draw-out direction thereof;   a lower plate fixed to said retractor base;   a movable clamp member for holding said webbing between said lower plate and said clamp member;   a guide member for guiding said clamp member to a webbing holding position;   an emergency lock mechanism for locking the rotation of said winding shaft in the webbing draw-out direction; and   a lever member for moving said clamp member in a webbing holding direction in linking with said emergency lock mechanism,   wherein said clamp member includes a clamp teeth portion for clamping and engaging said webbing with a webbing opposing surface of said clamp member, a plane portion located on an opposite side to said webbing opposing surface, and a rear end side edge on a rear end side of said plane portion,   wherein said guide member is formed of a hollow member having a rectangular section, said guide member including a sliding contact surface for sliding contact with said plane portion of said clamp member end a deforming portion deformable substantially in parallel to said webbing opposing surface of said clamp member, wherein said guide member includes:   a main cantilever piece having a leading end thereof projected as a free end;   an extension tongue portion formed in the leading end of said main cantilever piece;   a sub-cantilever piece opposed to said extension tongue portion;   a first deforming portion located on a base end side of said main cantilever piece; and   a second deforming portion located on a base end side of said sub-cantilever piece;   wherein said guide member is structured so that, if a tensile force of a predetermined value or greater is applied to said webbing, said first deforming portion is deformed by said rear end side edge of said clamp member in accordance with the movement of said clamp member in a webbing draw-out direction, and said second deforming portion is deformed by said main cantilever piece folded by the deformation of said first deforming portion.   
     
     
       7. A retractor including a clamp mechanism for holding a webbing directly to prevent the webbing from being drawn out in a vehicle emergency, comprising; a retractor base;   a deforming pin inserted through said retractor base;   a winding shaft supported rotatably on said retractor base for winding a webbing thereround;   a ratchet plate mounted on said winding shaft;   a pawl member engageable with said ratchet plate for locking the rotation of said winding shaft in a webbing draw-out direction thereof;   a lower plate fixed to said retractor base:   a movable clamp member for holding said webbing between said lower plate and said clamp member;   a guide member for guiding said clamp member to a webbing holding position;   an emergency lock mechanism for locking the rotation of said winding shaft in the webbing draw-out direction; and   a lever member for moving said clamp member in a webbing holding direction in linking with said emergency lock mechanism,   wherein said clamp member includes a clamp teeth portion for clamping and engaging said webbing with a webbing opposing surface of said clamp member, a plane portion located on an opposite side to said webbing opposing surface, and a rear end side edge on a rear end side of said plane portion,   wherein said guide member is formed of a hollow member having a rectangular section, said guide member including a sliding contact surface for sliding contact with said plane portion of said clamp member and a deforming portion deformable substantially in parallel to said webbing opposing surface of said clamp member, and said guide member includes a main cantilever piece having a leading end thereof projected as a free end and an extension tongue portion formed in the leading end of said main cantilever piece, and   wherein said guide member is structured so that, if a tensile force of a predetermined value or greater is applied to said webbing, the deforming portion of said guide member is deformed by said rear end side edge in accordance with the movement of said clamp member in a webbing draw-out direction, and said deforming pin in deformed by said extension tongue piece of said cantilever piece folded by the deformation of said deforming portion.   
     
     
       8. A retractor including a clamp mechanism for holding a webbing directly in a vehicle emergency, comprising: a retractor base;   a winding shaft supported rotatably on said retractor base for winding a webbing thereround;   a ratchet plate mounted on said winding shaft;   a pawl member engageable with said ratchet plate for locking the rotation of said winding shaft in a webbing draw-out direction;   a lower plate fixed to said retractor base; and   a movable wedge-shaped clamp member for holding said webbing between said lower plate and said clamp member,   wherein said clamp member includes a hold portion for clamping and engaging said webbing, and said hold portion including a clamp teeth portion formed in a shape capable of biting into a surface of said webbing and shearable and deformable by a tensile force of a predetermined value or greater, and said clamp member includes a pressure teeth portion capable of applying resistance to said webbing moved in the webbing draw-out direction by a tensile force of a predetermined value or greater.   
     
     
       9. The retractor of claim 8, further comprising an emergency lock mechanism for locking the rotation of said winding shaft in the webbing draw-out direction in a vehicle emergency, a guide member for guiding said clamp member to a webbing holding position, and lever members for moving said clamp member in the webbing holding direction in linking with said emergency lock mechanism.